[petsc-users] Copy dense matrix into half part of another dense matrix

[medane.tchakorom at univ-fcomte.fr]

Dear PETSc users,

I hope this message finds you well. I don’t know If my question is relevant, but I’am currently working with DENSE type matrix, and would like to copy one matrix R_part [ n/2 x m] (resulted from a MatMatMult operation) into another dense matrix R_full [n x m].  
Both matrices being on the same communicator, I would like to efficiently copy R_part in the first half of R_full. 
I have being using MatSetValues, but for large matrices, the subsequent assembling operation is costly.
Please could you suggest me some strategies or functions to do this efficiently. 

Thank you for your time and assistance.

Best regards,
Tchakorom Medane